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Originally released Aug. 1, 2007, this image is of Mars' Russell Crater dune field, which is covered seasonally by carbon dioxide frost. This image shows the dune field after the frost has evaporated from solid to gas, with just a few patches remaining of the bright seasonal frost. Numerous dark dust devil tracks can be seen meandering across the dunes. Image Credit: NASA/JPL-Caltech/University of Arizona
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